Migraine Headaches Introduction

Causes of Secondary Headaches

About 90% of people seeking help for headaches have a primary headache disorder. The balance of secondary headaches is caused by an underlying disorder that produces the headache as a symptom. Many conditions cause headaches as a symptom. Some of the most common are listed below.

Sinus Headache. Many primary headaches, including migraine, are misdiagnosed as sinus headaches. In fact, nearly 9 in 10 patients who think they have sinus headaches actually have or probably have had a migraine. Sinus headaches occur in the front of the face, usually around the eyes, across the cheeks, or over the forehead. They are usually mild in the morning and increase during the day and are usually accompanied by fever, runny nose, congestion, and general debilitation. Sinus headaches spread over a larger area of the head than migraines, but telling the difference between these two kinds of headache is difficult, particularly if a headache is the only symptom of sinusitis. The two may even coexist in many cases. Often, the visual changes associated with migraine can rule out sinusitis, but such visual changes do not occur with all migraines. (In rare cases, sinusitis can cause double vision and even vision loss, a sign of very serious infection.)

Headache Due to Neck Problems. Some headaches may be caused by abnormalities of the neck muscles resulting from prolonged poor posture (such as that caused by sitting in front of a computer keyboard or driving daily for long periods), arthritis, injuries of the upper spine, or abnormalities in the cervical spine (the spinal bones in the neck). Nerves in the neck converge in the trigeminal nerve in the face and can generate pain signals that the brain may interpret as headache. Pain is usually on one side. Even if it affects both sides of the head, it is usually more severe on one side. The quality of the headache may be similar to an aching tension headache or a mild migraine without aura.

Temporomandibular Joint Dysfunction (TMJ). TMJ is caused by clenching the jaws or grinding the teeth (usually during sleep), or by abnormalities in the jaw joints themselves. The diagnosis is easy if chewing produces pain or if jaw motion is restricted or noisy. TMJ pain can occur in the ear, cheek, temples, neck, or shoulders.

Glaucoma. Acute glaucoma is caused by increased pressure in the eye and requires immediate medical attention. Throbbing pain may be felt around or behind the eyes or in the forehead. Patients have redness in the eye and may see halos or rings around lights.

Brain Tumor. Fear of brain tumor is common among people with headaches, but a headache is almost never the first or only sign of a tumor. Changes in personality and mental functioning, vomiting, seizures, and other symptoms are more likely to appear first. When the headache does develop, it is often worse early in the morning or may awaken sufferers during the night.

Neuralgia. Neuralgia is pain due to nerve abnormalities, which can occur in the facial area and resemble migraine or sinus headaches.

Hypertension. Although many people attribute headaches to high blood pressure, the two are rarely associated. An exception is malignant hypertension, an uncommon medical emergency, in which the blood pressure abruptly rises to extreme levels, causing damage to blood vessels in the brain, heart, and kidneys.

Strokes Caused by Blood Clots or Hemorrhages. A blood clot or hemorrhage in the brain leading to a stroke can cause a severe headache, sometimes referred to as a thunderclap headache when it is very sudden and severe. The onset of such a headache, particularly if it is associated with confusion, stupor, or other neurologic symptoms, mandates prompt medical attention. It is important to determine if a clot or bleeding is causing the stroke, since treatments are very different.

Head Injuries. It is obvious that a significant blow to the head will cause pain. Post-injury headaches, however, can reflect serious damage, ranging from skull fractures to internal bleeding.

Disorders of the Meninges. The meninges are the membranes covering the brain and the spinal cord. In very rare instances, ordinary physical strain may injure or weaken the meninges, causing a leakage of cerebrovascular fluid (the fluid that bathes the brain). This can cause severe headache and nausea, which are relieved by lying flat. The condition is very treatable. Meningitis, which is an infection or irritation of these membranes, is an uncommon but potentially serious cause of severe headache. Other symptoms include nausea and stiffness or pain in the neck.

Gynecologic Problems. Many clinicians have anecdotally linked gynecologic problems, such as ovarian cysts and menstrual disorders, to chronic headaches, and new data are emerging to support this association.

Temporal (Giant Cell) Arteritis. Certain causes of headaches are unique to the elderly, such as temporal arteritis, also called giant cell arteritis. Inflammation in arteries that carry blood to the head, neck, and sometimes the upper part of the body can cause very severe headaches. The risk for this headache is highest in people over age 70, especially among women, people of European heritage, and patients with polymyalgia rheumatica.

Miscellaneous Causes of Benign Headaches. Rapid consumption of ice cream or other very cold foods or beverages is the most common trigger of sudden headache pain. (It may be prevented by warming the food or drink for a few seconds in the front of the mouth before swallowing.) Other common benign causes of headache include eyestrain, dental problems, allergies, systemic infections, and caffeine withdrawal. Headaches may be induced by sexual activity or intense physical exertion. Leakage from spinal cord fluid is rare but can cause headaches that may be mistaken for brain tumors.